#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<unordered_set>

using namespace std;

int main()
{
	int ar[] = { 1, 1,1,1,1, 21, 31, 4, 5, 6, 7 };
	unordered_set<int> us;
	for (auto& e : ar)
	{
		us.insert(e);
	}
	
	cout << us.count(1) << endl;
	cout << us.bucket_count() << endl;
	cout << us.count(11) << endl;
	cout << us.count(21) << endl;
	cout << us.count(0) << endl;
	
	return 0;
}
